One could argue, for example, that 220V is a better electrical system than 110V for basic household voltage. And it's certainly feasible to have a household electricity system at 220V instead of 110V - again, that's Europe. But there's no feasible way you would ever convert the US from a 110V to a 220V system. It would cause too much disruption to too many people for it to ever get support.

That's not a good analogy. There are trillions of dollars of physical infrastructure that would have to be replaced, starting from power stations, through every refrigerator and light bulb, and the wiring and electric panel in every home.

The benefits to single payer are much more pronounced than 220V wiring...but then again, there's a lot more stakeholders with vested interests in the current system (no pun intended) in healthcare.

Indeed, the benefits are greater and the obstacles smaller and mostly political. Medicare itself came in to being in 1965, and it didn't shatter the U.S. economy. It mostly helped make the U.S. population healthier on average. When the Obama admin came up with Obamacare they could have made it much more rational. They didn't because they sought compromise with the Repugnicans, which they never got. They created an albatross that is half as good as it could have been. All it takes is political courage, which the Democrats lack too often.